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MULTIPLE CRC INSERTION IN AN OUTPUT DATA STREAM

  • US 20090210769A1
  • Filed: 02/14/2008
  • Published: 08/20/2009
  • Est. Priority Date: 02/14/2008
  • Status: Active Grant
First Claim
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1. A computer program product for inserting multiple cyclic redundancy checks (CRCs) in an output data stream from a channel subsystem to a control unit of an input/output (I/O) processing system, the computer program product comprising:

  • a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising;

    receiving a message to transmit from the channel subsystem to the control unit via the output data stream;

    determining a first CRC insertion position in the output data stream;

    receiving a first CRC calculated over a first block of data in the message;

    inserting the first calculated CRC in the output data stream at the first CRC insertion position;

    determining a second CRC insertion position in the output data stream;

    receiving a second CRC calculated over a second block of data in the message; and

    inserting the second calculated CRC in the output data stream at the second CRC insertion position.

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